US4121256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Column electrode drive for gas discharge display device
Assignee: US Philips Corp
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Filing: 1977-03-10
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Granted: 1978-10-17
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Expires: 1997-03-10
Abstract
Abstract A saving in column memory elements while preserving a stable display with a gas discharge television display device is obtained if a plurality of bits of the digital video information which is entered in the line trace period is passed from the line memory circuit to the relevant column electrode in the line blanking period while bypassing a column memory circuit. The display elements are excited only once during a line period at the beginning of the line period.
Inventors
- 👤 Jean Hubertus Josef Lorteije
- 👤 Geert Warrink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:23
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/28; H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/125; G09G2310/00; G09G2310/02; G09G2310/0264; G09G2310/0272
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
A display device comprising a plurality of display elements arranged in rows and columns, including row conductors and column conductors; a row scanning circuit connected to said display elements for scanning said rows of said display element; means which control activation of said column conductors connected to said column conductors; a digital line memory circuit for storing digital video information to be displayed during a line period of said row scanning circuit; a column memory circuit connected to said line memory circuit for acquiring a first portion of video information therefrom, and to means which control activation of said column conductors in response to said first portion of video information; means connecting said digital line memory circuit to said means which control activation of said column conductors, by passing said column memory circuit, which provide a second portion of said digital video information stored in said memory circuit to said column conductors during a line blanking period, the display of said first and second portions of said video information taking place during the same line period.
Claim 2
Dependent Claim
176 words
A display device comprising a plurality of display elements arranged in rows and columns, including row conductors and column conductors; a row scanning circuit connected to said display elements for scanning said rows of said display element; means which control activation of said column conductors connected to said column conductors; a digital line memory circuit for storing digital video information to be displayed during a line period of said row scanning circuit; a column memory circuit connected to said line memory circuit for acquiring a first portion of video information therefrom, and to means which control activation of said column conductors in response to said first portion of video information; means connecting said digital line memory circuit to said means which control activation of said column conductors, by passing said column memory circuit, which provide a second portion of said digital video information stored in said memory circuit to said column conductors during a line blanking period, the display of said first and second portions of said video information taking place during the same line period.
Claim 3
Dependent Claim
38 words
A device as defined in claim 1, wherein said column memory circuit comprises a predetermined number of 1-bit memory storage elements, said predetermined number being approximately half the number of bits of video information in each picture element.
Claim 4
Dependent Claim
36 words
A device as defined in claim 1, wherein said means which control activation of said column conductors comprises a current source circuit connected between said line memory circuit, said column memory circuit, and said column conductors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |